#include <iostream>
using namespace std;
int main()
{
    double r,h,v;
    cout<<"请输入圆柱体的底面半径"<<endl;
    cin>>r;
    cout<<"请输入圆柱体的高"<<endl;
    cin>>h;
    v=3.14159265*r*r*h;
    cout<<"圆柱体的体积为"<<v <<endl;
    return 0;
}